“Talk about diminishing returns: When "Rocket", Goldfrapp's first single from their forthcoming fifth full-length Head First, leaked late last month, its frothy synth stabs and propulsive melody brought sighs of relief to anyone that was bored to tears from the electro-pop outfit's last effort, 2008's pastorally bland Seventh Tree. However, somewhat flat-sounding production and chanteuse Alison Gol”